Universal electric induction heating element.



J. L. ANDERSON.

UNIVERSAL ELECTRIC INDUCTION HEATING ELEMENT.

APPLICATION FILED OOT.30,1911.

Patented Apr. 23, 1912.

3 SHEETSSHEET 1.

Inventor by I l nesses r Attorneys J. L. ANDERSON.

UNIVERSAL ELECTRIC INDUCTION HEATING ELEMENT.

APPLICATION FILED 00130, 1911.

Patented Apr. 23, 1912.

I 3 SHEETSr-SHEET 2.

Witnesses Inventor I 1 I a Attorneys J. L. ANDERSON.

UNIVERSAL ELEGTRIG INDUCTION HEATING ELEMENT.

APPLICATION FILED 00130, 1911.

1,023,791 Patented Apr. 2-3, 1912.

3 SHEBTS-SHBET 3.

r I Inventor 1%,. Attorneys J'OHN- L. annnnsomor OGDEN, UTAH.

UNIVERSAL ELECTRIC INDUQTION HEATING ELEMENT.

Application filed October 30, 1911. Serial No. 657,574.

i T all whom it may concern Be it known that I, JOHN L, ANDERSON, a citizen of the United States, residing at Ogden, in the county of Weber and State of Utah, have invented a new and useful Universal Electric Induction Heating Element, of which the following is a specification:

The present invention relates to-a'n improved universal electric induction heating element or unit, the primary object of the invention being the provision of a heating element or unit which is essentially a transformer, the magnetic circuit of which also constitutes the secondary circuit of the heat-- ing element or unit. I

A further object of the invention, is the provision of an electric induction heating element or unit, designed "foryuse in all classesof heating appliances, as for heaters, cook stoves,-fireless cookers, and sad irons. With the vforegoing and other objects in view which will appear as the description proceeds, the invention resides in the. combination and arrangement of partsand in the details of coustruction hereinafter described and claimed, it being understood that changes in .the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of'the invention. In the drawings:Figure 1' is atop plan view of an element to be 'used as a fireless cooker. Fig. 2 is a vertical section taken on line 22 of Fig. 1. Fig. 3 is a top plan view of an element to be used with an oven. Fig. 4 is a side elevation thereof, with a portion is section to show the interior structure. Figs. 5 and 6 are views of the element when used for car heater radiators and the like. Figs. 7 and 8 are forms taken by the element as applied to water heaters.

Referring to the drawings, and'more particularly to the structure shown in Figs. 1

through 8, wherein the elementtakescon difi'erent forms, but is essentially identical,

the numerals 1 and 2, respectively, indicate the inner shell and the outer shell, which are concentric cylinders made of wrought iron.

The innershell" 1, is rolled or flared out- Wardly at its ends 4 and 4', so that the 0ut .side diameter of the ends is equal to the in- .side diameter of the outside shell 2 and is hazed or welded thereto. This construction provides the annular space 3 between the shells and the hermetically inclosed ends 4 and 4', so that the primary or inducing Specification of Letters Patent.

Patented Apr. 23, 1912.

winding or coil 5 is retained waterproof, the fireproof insulator 6, being placed between the shell 1 and said winding 5. This primary winding is wound circumferentially about the outside of the shell 1, and the outer shell 2,- is slipped over this, thus entirely hermetically inclosing the winding 5. The terminals of the primary winding 5 are brought out to the posts 7, which are carried by the porcelain terminal block 8.

The two cylindrical shells l and 2 form a closed magnetic circuit, which links with be considered, as constituting a single shortcircuited turn of the secondary circuit. The current in this secondary circuit is limited in value only by the induced voltage and the electrical resistance of the shells. It

will thus'be seen that it is only a matter of properly proportioning the magnetic and electric circuits to secure a device of the desired wattage or capacity.

As shown in Figs. 7 and 8, a plurality of shells 1 and a single shell 2, is employed, this cellular or sectional construct-ion being essentially, only a feature of design, and not of principle.

It has been discjovered that, magnetic leakage plays an important part,

unless the magnetic circuit is made relatively short. Where a heating element in the form shown in Figs. 7 and 8, is desired, it has been found that all leakage difilculties are overcome by cutting up the magnetic circuit in a number of short circuits by means employingthe series or plurality of shells 1 and the windings 5, as shown instead of a single shell 1, asshown in Fi 1 through-6.

It is deemed only necessary to show the four shapes, illustrated'in Figs. 1 through 8,

.butit is to be understood that various other shapes may be .designed for similar or different purposes, and still be within the scope of this invention. Y

device, the heat is generated in the surface.

of the heater, thus making it a quick and highly efficient heating element. Electrically speaking, the construct-ion of this device is ideal, as practically all of its material is active material.

From the foregoing descriptiontaken in connection with the drawings, it is evident that the herein described and shown heating element is in reality a transformer, per 86, constructed invarious shapes to provide a heating unit, the current flowing theretoand the magnetic current generated therein, being varied to secure radiation of heat from said element in varying degrees, that is a minimum heat to a maximum heat may be obtained for the various purposes.

What is claimed, is

1. An electric induction heating element having two nested members hermetically sealed at their respective ends and providing a coil retaining chamber therebetween, and a coil disposed in said chamber, and forming with the members a transformer.

2. An electric induction heating element, having two nested metallic members hermetically sealed at their respective ends and forming a compartment therebetween, both of said members constituting the closed magnetic circuit of a transformer, anda primary winding disposed within the compartment between the nested members and linked with the magnetic circuit of said members. i

3. An electric induction heating elementv having two nested members hermetically sealed at their respective ends and providing a compartment therebetween, a primary winding mounted Within the compartment,

and terminal posts connected to said wind- 7 ing exteriorly of one of said nested members, whereby the two members constitute a closed magnetic circuit linking with the primary winding to cause magnetism to flow axially through the members.

4. An electric induction heating element, having two nested members composed of magnetic metal and hermetically sealed at their respective ends to provide a coil. receiving compartment, a primary coil disposedwithin said compartment with a fire proof insulation interposed between the coil and the adjacent portions of the nested members, and terminal posts carried by one of said members and connected to the coil, whereby an alternating field produces current in the respective members circumferentially thereof.

5. An electric induction heating element, having two nested members composed of magnetic metal and hermetically sealed at their respective ends to provide a coil re ceiving compartment, a primary coil disposed in said compartment with a fire proof insulation interposed between the coil and the adjacent portions of the nested members, whereby the nested members form a closedmagnetic circuit linked with the said coil to cause magnetism to flow axially through the said nested members.

6. An electric induction heating ,element, having two nested shells composed of ma netic metal and hermetically sealed at their respective ends to provide a coil-receiving compartment, a primary coil disposed in 'said compartment with a fire proof insulation interposed between thecoil and the adjacent portions of the nested shells, and terminal posts carried by one of said members and connected to the coil, whereby the nested shells form a closed magneticcircuit linked with the coil to cause magnetism to flow axially through the said nested shells.

In testimony that I claim the foregoing as my own, I have hereto afiirted my signature in the presence of two witnesses.

JOHN L. 'ANnERsoN.

Witnesses:

C. V. ZINN, P. E. THOMAS. 

